Peelply fabrics are normally a smooth, tightly woven nylon or polyester fabric. Other fibres like glass and Aramid are also used, but only for certain applications. If phenolic resins are used, it is advisable not to use nylon, but rather a polyester type peelply. It is important to remove the peelply fabric before the part / mould goes into operation. Peelply fabrics are there to impose a clean, uncontaminated surface ready for bonding or painting.